Very difficult sudoku #1647
| 1 | 8 | |||||||
| 9 | 6 | 7 | ||||||
| 5 | 3 | 2 | 9 | 1 | ||||
| 8 | 7 | 9 | ||||||
| 1 | 3 | 2 | ||||||
| 7 | 9 | 5 | 3 | |||||
| 2 | 7 | |||||||
| 9 | 6 | 5 | 8 | |||||
| 3 |
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